Date: Fri, 6 Oct 2000 17:13 -0400
From: bugzilla@redhat.com
To: redhat-watch-list@redhat.com
Subject: [RHSA-2000:077-03] esound contains a race condition
Red Hat, Inc. Security Advisory
Synopsis: esound contains a race condition
Advisory ID: RHSA-2000:077-03
Issue date: 2000-10-06
Updated on: 2000-10-06
Product: Red Hat Linux
Keywords: esound security esd socket Gnome
Cross references: N/A
1. Topic:
Esound, the Gnome sound server, contains a race condition that a
malicious user could exploit to change permissions of any file
owned by the esound user.
2. Relevant releases/architectures:
Red Hat Linux 6.0 – i386, alpha, sparc
Red Hat Linux 6.1 – i386, alpha, sparc
Red Hat Linux 6.2 – i386, alpha, sparc
Red Hat Linux 6.2EE – i386, alpha, sparc
Red Hat Linux 7.0 – i386
Red Hat Linux 7.0J – i386
3. Problem description:
Esound, the sound daemon used for Gnome, creates a
world-writable directory, /tmp/.esd. This directory is owned by the
user running esound, and is used to store a socket which is used by
programs connecting to the sound server. During startup, this
socket’s permissions are adjusted. An attacker on the system can
theoretically create a symbolic link, and cause any file or
directory owned by the user running esound to be made world
writable.
The new packages fixes this race condition.
4. Solution:
For each RPM for your particular architecture, run:
rpm -Fvh [filename]
where filename is the name of the RPM.
All active Gnome sessions should also be restarted after the
upgrade is applied.
5. Bug IDs fixed (http://bugzilla.redhat.com/bugzilla
for more info):
N/A
6. RPMs required:
Red Hat Linux 6.x:
alpha:
ftp://updates.redhat.com/6.2/alpha/esound-0.2.20-0.alpha.rpm
ftp://updates.redhat.com/6.2/alpha/esound-devel-0.2.20-0.alpha.rpm
sparc:
ftp://updates.redhat.com/6.2/sparc/esound-0.2.20-0.sparc.rpm
ftp://updates.redhat.com/6.2/sparc/esound-devel-0.2.20-0.sparc.rpm
i386:
ftp://updates.redhat.com/6.2/i386/esound-0.2.20-0.i386.rpm
ftp://updates.redhat.com/6.2/i386/esound-devel-0.2.20-0.i386.rpm
sources:
ftp://updates.redhat.com/6.2/SRPMS/esound-0.2.20-0.src.rpm
Red Hat Linux 7.0:
i386:
ftp://updates.redhat.com/7.0/i386/esound-0.2.20-1.i386.rpm
ftp://updates.redhat.com/7.0/i386/esound-devel-0.2.20-1.i386.rpm
sources:
ftp://updates.redhat.com/7.0/SRPMS/esound-0.2.20-1.src.rpm
7. Verification:
MD5 sum Package Name
4f7a81fe6b7f5a419272659b92d1dfc1 6.2/SRPMS/esound-0.2.20-0.src.rpm
648746086daa7bbc6bef00697e62bf51 6.2/alpha/esound-0.2.20-0.alpha.rpm
8a7dbf7dabbd7d9ca2861c1ecf2b2d5f 6.2/alpha/esound-devel-0.2.20-0.alpha.rpm
962fa1129804f2d8470e1767a352f77f 6.2/i386/esound-0.2.20-0.i386.rpm
784ec77026228d31d823e619c1de78d8 6.2/i386/esound-devel-0.2.20-0.i386.rpm
2127fdd7654b80506952dce08c3f5014 6.2/sparc/esound-0.2.20-0.sparc.rpm
0c191eee05a89dc0d12b3ca4981d2353 6.2/sparc/esound-devel-0.2.20-0.sparc.rpm
24f8e1b106500565e8426ad96150a001 7.0/SRPMS/esound-0.2.20-1.src.rpm
a61209acb87ed7f4fa5b1d63d161c85d 7.0/i386/esound-0.2.20-1.i386.rpm
6b326c66d570ee59eda7c2daf0ab4721 7.0/i386/esound-devel-0.2.20-1.i386.rpm
These packages are GPG signed by Red Hat, Inc. for security. Our
key is available at:
http://www.redhat.com/corp/contact.html
You can verify each package with the following command:
rpm –checksig <filename>
If you only wish to verify that each package has not been
corrupted or tampered with, examine only the md5sum with the
following command:
rpm –checksig –nogpg <filename>
8. References:
BugTraq ID: 1659 (http://www.securityfocus.com/bid/1659)
Copyright(c) 2000 Red Hat, Inc.